Sequential pyrolysis of plastic to recover polystyrene HCL and terephthalic acid

Patent · Sat Dec 31 23:00:00 EST 1994

OSTI ID:870145

Evans, Robert J ^[1]; Chum, Helena L ^[2]

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1. Lakewood, CO
2. Arvada, CO

A process of pyrolyzing plastic waste feed streams containing polyvinyl chloride, polyethylene terephthalate, polystyrene and polyethylene to recover polystyrene HCl and terephthalic acid comprising: heating the plastic waste feed stream to a first temperature; adding an acid or base catalyst on an oxide or carbonate support; heating the plastic waste feed stream to pyrolyze polyethylene terephthalate and polyvinyl chloride; separating terephthalic acid or HCl; heating to a second temperature to pyrolyze polystyrene; separating styrene; heating the waste feed stream to a third temperature to pyrolyze polyethylene; and separating hydrocarbons.

• Research Organization: MIDWEST RESEARCH INSTITUTE
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-83CH10093
• Assignee: Midwest Research Institute (Kansas City, MO)
• Patent Number(s): US 5464602
• OSTI ID: 870145
• Country of Publication: United States
• Language: English

Related Subjects

/423/585/588/
acid
acid comprising
adding
base
carbonate
carbonate support
catalyst
chloride
comprising
containing
containing poly
feed
feed stream
feed streams
hcl
heating
hydrocarbons
oxide
plastic
plastic waste
polyethylene
polystyrene
polystyrene hcl
polyvinyl
polyvinyl chloride
process
pyrolysis
pyrolyze
pyrolyzing
recover
recover polystyrene
separating
sequential
sequential pyrolysis
stream
streams
streams containing
styrene
support
temperature
terephthalate
terephthalic
third
vinyl chloride
waste
waste feed